Set<Coordinate> within10k = new HashSet<>();
        for (int x = 0; x <= maxX; x++) {
            for (int y = 0; y <= maxY; y++) {
                int sum = 0;
                for (Coordinate c : coords) {
                    sum += manhattanDistance(c, x, y);
                }
                if (sum < 10000) {
                    within10k.add(new Coordinate(x, y));
                }
            }
        }